https://dumas.ccsd.cnrs.fr/dumas-00689422 Contributor : ESPE LNFConnect in order to contact the contributor Submitted on : Thursday, April 19, 2012 - 3:37:08 PM Last modification on : Wednesday, February 23, 2022 - 1:28:06 PM Long-term archiving on: : Friday, July 20, 2012 - 2:43:32 AM